The Dallas Mavericks are acquiring forward Grant Williams in a four-year, $54 million sign-and-trade deal with the Boston Celtics. The agreement is part of a multi-team trade that includes the San Antonio Spurs, according to Shams Charania of The Athletic and Stadium.

As part of the deal, Dallas is sending forward Reggie Bullock and an unprotected 2030 draft pick swap to San Antonio. Boston is receiving multiple second-round draft picks.

Rumors since before the start of free agency indicated that the Mavericks were interested in signing Williams, who entered this offseason as a restricted free agent. Adding Williams gives the Mavericks some needed size on the perimeter and rebounding inside.

Last season, Williams appeared in 79 games with the Celtics, primarily in a reserve role. He averaged 8.1 points 4.6 rebounds and 1.7 assists in 25.9 minutes — all career highs. However, he had a down shooting year, connecting on 45.4% of his overall shots and 39.5% from deep.

Williams played an integral part of deep playoff runs for the Celtics the last two seasons, including a trip to the NBA Finals in 2022. During the Finals run, he averaged 8.6 points and 3.8 rebounds while shooting 43.3% overall. In Boston’s most recent playoff run to the Western Conference Finals, he averaged 5.1 points, 2.2 rebounds and 1.2 assists. Williams shot 47.2% overall in last season’s playoffs.